Adsorptive removal of bisphenol-A by rice husk ash and granular activated carbon-A comparative study

作者：Sudhakar P; Mall Indra Deo^*; Srivastava Vimal Chandra

来源：Desalination and Water Treatment, 2016, 57(26): 12375-12384.

DOI：10.1080/19443994.2015.1050700

• Bisphenol A
• Rice husk ash
• Granular activated carbon
• Adsorption kinetics
• Adsorption isotherm

Present study was performed so as to compare adsorptive removal efficiencies of low-cost adsorbent rice husk ash (RHA) and commercial granular activated carbon (GAC) for the removal of bisphenol-A (BPA), an endocrine disrupting chemical, from aqueous solution. Effect of variables such as initial concentration (C-0), adsorbent dose (m), temperature (T), pH, and time (t) were studied. Optimized values at C-0=100mg/L were found to be: m=30g/L, t=3h for RHA whereas for GAC, optimum values were: m=20g/L and t=2h. Pseudo-second-order model best represented the adsorption kinetic data; and Freundlich and Temkin models best fitted the isotherm data. The adsorption of BPA onto GAC and RHA was found to be endothermic in nature. Value of change in entropy and enthalpy for BPA adsorption onto RHA was found to be: 21.38J/molK and 0.335kJ/mol, respectively. Respective values for BPA adsorption onto GAC were found to be: 29.6J/molK and 4.03kJ/mol, respectively.

• 出版日期2016-6-2